Why this body, at this time?
This is something I keep coming back to constantly outside of the "what consciousness is", however it does tie into it. We probably also need to know the what before the why!
However.. what are your theories on the why? Why am I conscious in this singular body, out of all time thats existed, now? Why was I not conscious in some body in 1750 instead? Or do you believe this repeats through a life and death cycle?
If it is a repetitive cycle, then that opens up more questions than answers as well. Because there are more humans now than in the past, we also have not been in modern "human" form for a long time. Also if it were repetitive, you'd think there would be only a set number of consciousnesses. And if that's the case, then where do the new consciousnesses for the new humans come from? Or are all living things of the entire universe (from frog, to dogs, to extraterrestrials) part of this repetition and it just happens you (this time) ended up in a human form?
I know no one has the answers to all these questions, but it's good to ponder on. Why this body, and why now of all time?